Alkaline Earth MetalsBe, Mg, Ca, Sr, Ba, RaShiny, silvery-white metalsForm compounds (oxides) with oxygenOccur in nature and burn with bright, colourful flamesNoble GasesMost unreactive elements"don't mix with commoners"Complete valence shellsColourless odourless gasesHe, Ne, Ar, Kr, Xe, RnHalogensF, Cl, Br, I, AtReactive elementsGases, a liquid and some solidsCan form poisonous compoundsThe Families of the Periodic Table Thank you!Lets look at chlorine!The periodic table is arranged in a very specific way-the rows across horizontally are called PERIODSThe columns (up and down) are called groups or familiesdifferent people have tried some wacky ways to organize the elements!But Mendeleev was very SMART! The First Family-The Alkali Metals!How sad! That whole video was FAKE! They used depth charges in the bathtubs....You can't always believe what you see on the internet! Tomorrow and Wednesday you will work in the library on your Periodic Table of.............. project! Have a look around the room at the ones on the bulletin boards.....they show trends going across the periods and in the families (columns) Can you see the trends? All elements in period 1 have one shellAll elements in period 2 have two shellsAll elements in period 3 have .......see a trend? All elements in group/family 1 have 1 valence electronAll elements in group/family 2 have 2 valence electrons